package day2.可变字符串;

import day1.demo4.Person;
import day1.demo4.Stu;

public class Test {
    public static void main(String[] args) {
        StringBuffer sb = new StringBuffer();
        sb.append("one");
        StringBuffer delete = sb.delete(0, 1);
        System.out.println(sb == delete);
        sb.replace(0,1,"hello");
        System.out.println(sb);
        Object o;
        A a=null;
        A.a();

    }
}
